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Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Oct. 31, 2025 | Jan. 31, 2025
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | $ 722,713 | $ 632,786
Gross Unrealized Gains | 739 | 535
Gross Unrealized Losses | (146) | (407)
Estimated Fair Value | 723,306 | 632,914
Cash | 325,100 | 464,700
Level 2 | Available-for-sale securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 464,516 | 448,901
Gross Unrealized Gains | 739 | 535
Gross Unrealized Losses | (146) | (407)
Estimated Fair Value | 465,109 | 449,029
Money market funds | Level 1 | Cash Equivalents |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 258,197 | 183,885
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 258,197 | 183,885
Commercial paper | Level 2 | Available-for-sale securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 32,777 | 31,367
Gross Unrealized Gains | 7 | 12
Gross Unrealized Losses | (6) | (8)
Estimated Fair Value | 32,778 | 31,371
Corporate notes and bonds | Level 2 | Available-for-sale securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 410,241 | 399,034
Gross Unrealized Gains | 730 | 522
Gross Unrealized Losses | (126) | (378)
Estimated Fair Value | 410,845 | 399,178
U.S. governmental securities | Level 2 | Available-for-sale securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 21,498 | 18,500
Gross Unrealized Gains | 2 | 1
Gross Unrealized Losses | (14) | (21)
Estimated Fair Value | $ 21,486 | $ 18,480

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